Detection of ion concentration in a liquid

Details Detection of ion concentration in a liquid Detection of ion concentration in a liquid

1983-09-23

1986-05-20

Levy, Stewart J.

Electricity: measuring and testing

Magnetic

Fluid material examination

G01N 2774

Patent

active

045904243

ABSTRACT:
A detector of ion concentration in a liquid is composed of a detection cell comprising a tubular piece formed from an electrically insulating material with a central passage which is fed with a liquid whose ion concentration is to be measured. A conducting coil is placed around the tubular piece, and is part of a first resonant circuit. A second reference resonant circuit is also provided, and signals of fixed frequency are applied in parallel to the two resonant circuits, and a comparator delivers a signal having a magnitude representative of the difference between the output signals from the two resonant circuits. Such a detector finds a use for example in liquid chromatography.

REFERENCES:
patent: 2779917 (1957-01-01), De Boisblanc
patent: 3076929 (1963-02-01), Gillerman
patent: 3292077 (1966-12-01), Sloughter
patent: 3404336 (1968-10-01), Rosenthal
patent: 4138639 (1979-02-01), Hutchins
patent: 4464926 (1984-08-01), Albarda et al.
Ogren, V. G. Sensor Circuit Utilizing Variable Inductance Input, IBM Tech. Discl. Bulletin, vol. 14, No. 4, Sep. 1971.
Bunyak et al., Resonant LC Circuit as a Contactless Conductometric Converter, Measurement Techniques vol. 17, No. 11, published Apr. 1975.

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